Water immersion objective details

WE are using Olympus UPLANSAPO (UIS 2) water immersion IR objective for DNA stretching and unzipping. The detail specifications of the objective can be found in the link:[1]
Other specification are as follows;

-

Mag

60X

Wavelength

1064

NA

1.2

medium

water

Max ray angle

64.5degrees

f #

26.5

Effective FL in water

1.5 to 1.6mm (distance between the focal spot and the exit aperture surface)